What is fly by wire system?

I am William Guy Redmond's personal historian an proud granddaughter. Fly-By- Wire is patent 3,679,156 Officially is the first analog to digital system. see P.I.N.G.S Tracing back to his 1951 MIT Masters Thesis " Design and Construction of an Artificial Reverberation Producer" Control lever Patent number 2,787,746 also his design. Servo trim system designed for F-8 , F7U-3 , F4J Fury Ra5C Vigialante and L-1011 He created a multiplex, monitered, fail-safe stability augmentation system that was used THROUGHOUT the aviation industry.

It's a computerized control system, as opposed to a directly mechanical control system. Pushing medals or moving the stick/wheel transmits a signal to a computer that then interprets it and applies it to hydraulics or motors that move the necessary mechanical components of the plane. With a mechanical control, moving the stick/wheel or pushing in pedals would proportionally move ropes or bars attached to the controls.

It means that the controls are electronic.
Originally, everything on a plane was mechanical. Whenever you moved the stick, throttle, rudder-pedals, etc, the input moved through a system of cables, pulleys, wheels, an hydraulics to move the control surfaces on the tail and wings and change the speed of the engines.
A plane with a fly by wire system uses electronics and computers transmit the input of the pilot to the applicable part of the plane.

Computerised.